在外贸易合同中，计量出口商品重量的方法有毛重和净重两种方法。

合同中未注明商品重量是按毛重还是净重计算时，则习惯上应按（）计算。

进出口贸易合同中数量条款的基本内容是成交商品的（）和（）。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

进口合同中的索赔条款有两种规定方法，在一般商品买卖合同中常用的是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

根据联合国《销售合同公约》规定：如果合同中未具体规定买方是按净重还是毛重支付货价，且双方已就标的物的计量方法发生疑问时，买方可以按（）支付货款。